METREL MI 3205 User manual

TeraOhm XA 5 kV

MI 3205

Instruction manual

Version 1.1; Code No. 20 752 446

2

Distributor:

Manufacturer:

METREL d.d.

Ljubljanska cesta 77

1354 Horjul

Slovenia

web site: http://www.metrel.si

e-mail: [email protected]

Mark on your equipment certifies that this equipment meets the requirements of the EU

(European Union) concerning safety and electromagnetic compatibility regulations

No part of this publication may be reproduced or utilized in any form or by any means

without permission in writing from METREL.

MI 3205 TeraOhm XA 5kV Table of contents

3

Table of contents

1 General Description ............................................................................................ 5

1.1 Features ........................................................................................................ 5

2 Safety and operational considerations ............................................................. 6

2.1 Warnings and notes ...................................................................................... 6

2.2 Battery and charging of Li-ion battery pack ................................................... 8

2.2.1 Precharge .............................................................................................. 9

2.2.2 Li – ion battery pack guidelines............................................................ 11

2.3 Standards applied ....................................................................................... 12

3 Instrument description ..................................................................................... 13

3.1 Instrument casing ....................................................................................... 13

3.2 Operator’s panel ......................................................................................... 13

3.3 Accessories ................................................................................................ 15

3.3.1 Test leads ............................................................................................ 15

3.4 Display organization.................................................................................... 16

3.4.1 Measurement result window ................................................................ 16

3.4.2 Measurement control window .............................................................. 17

3.4.3 Message window ................................................................................. 18

3.4.4 Battery, time and communication indication ........................................ 19

3.4.5 Measurement result line ...................................................................... 20

3.4.6 Graphical presentation of measured data ............................................ 20

3.4.7 Backlight operation .............................................................................. 20

4 Main menu ......................................................................................................... 21

4.1 Instrument Main menu ................................................................................ 21

4.2 Custom tests ............................................................................................... 22

4.2.1 Creating custom test ............................................................................ 22

4.3 Memory menu ............................................................................................. 23

4.3.1 Saving results ...................................................................................... 23

4.3.2 Recalling results .................................................................................. 24

4.3.3 Deleting results .................................................................................... 25

4.3.4 Deleting custom test ............................................................................ 25

4.3.5 Clearing complete memory content ..................................................... 26

4.4 Settings menu ............................................................................................. 26

4.4.1 Language selection .............................................................................. 27

4.4.2 Initial Settings selection ....................................................................... 27

4.4.3 Time selection...................................................................................... 27

4.4.4 Date selection ...................................................................................... 27

4.4.5 Transfer mode ..................................................................................... 28

4.4.6 Contrast selection ................................................................................ 28

4.4.7 Warning sound..................................................................................... 28

4.4.8 Graph selection .................................................................................... 28

4.4.9 Break Down selection .......................................................................... 29

4.4.10 Instrument info ..................................................................................... 29

4.5 Help Menu .................................................................................................. 29

5 Measurements ................................................................................................... 30

5.1 General information about high voltage testing ........................................... 30

5.1.1 The purpose of insulation tests ............................................................ 30

5.1.2 DC vs. AC testing voltage .................................................................... 30

MI 3205 TeraOhm XA 5kV Table of contents

4

5.1.3 Typical insulation tests ......................................................................... 30

5.1.4 Electrical representation of insulating material .................................... 31

5.2 Some application examples ........................................................................ 32

5.2.1 Basic Insulation resistance test ........................................................... 32

5.2.2 Voltage dependence test – Step Voltage Test ..................................... 32

5.2.3 Time dependence test – Diagnostic Test ............................................. 32

5.2.4 Withstanding Voltage Test ................................................................... 34

5.3 Guard terminal ............................................................................................ 35

5.4 Averaging options ....................................................................................... 36

5.4.1 The purpose of averaging .................................................................... 36

5.4.2 Example of averaging .......................................................................... 37

5.5 Measurement menu .................................................................................... 38

5.6 Insulation Resistance Measurement ........................................................... 39

5.6.1 Set Limit ............................................................................................... 41

5.7 Diagnostic test ............................................................................................ 42

5.7.1 Dielectric Absorption Ratio (DAR) ........................................................ 44

5.7.2 Polarization Index (PI) ......................................................................... 44

5.7.3 Dielectric Discharge Testing (DD) ........................................................ 45

5.8 Step Voltage testing .................................................................................... 47

5.9 Withstanding Voltage Test .......................................................................... 49

6 Communication ................................................................................................. 51

7 Maintenance ...................................................................................................... 52

7.1 Batteries insertion and replacement ........................................................... 52

7.2 Cleaning ...................................................................................................... 54

7.3 Periodic calibration...................................................................................... 54

7.4 Service ........................................................................................................ 54

8 Technical specifications ................................................................................... 55

8.1 General data ............................................................................................... 58

Appendix A – Remote Control ............................................................................... 59

MI 3205 TeraOhm XA 5kV General Description

5

1 General Description

1.1 Features

TeraOhm XA 5kV (MI 3205) is a portable battery (Li-ion) or mains powered test

instrument with excellent IP protection: IP65 (case closed), IP54 (case open), intended

for diagnosing of Insulation Resistance by using high test voltages of up to 5 kV. It is

designed and produced with the extensive knowledge and experience acquired through

many years of working in this field.

Available functions and features offered by the TeraOhm XA 5kV meter:

 Wide measuring range (10 kΩ ... 15 TΩ);

 Insulation Measurement;

 Step Voltage Test;

 Withstanding Voltage Test (DC) up to 5 kV;

 Polarization Index (PI);

 Dielectric Absorption ratio (DAR);

 Dielectric Discharge ratio (DD);

 Graph R(t);

 Adjustable test voltage (50 V...5 kV) 50 V and 100 V step;

 Programmable timer;

 Automatic discharge of test object after completion of measurement;

 Capacitance measurement;

 Input AC current noise rejection 1 mA@300 V (4 mA max);

 High voltage breakdown detection;

 Limit status;

 Additional averaging (filters) of the result (5, 10, 30, 60)

 Bluetooth, USB and RS232 communication;

 High power Li-ion battery pack (14.8V, 4.4Ah);

 High overvoltage category CAT IV / 600 V.

A 320x240 dot matrix LCD offers easy-to-read results and all associated parameters.

The operation is straightforward and clear to enable the user to operate the instrument

without the need for special training (except reading and understanding this Instruction

Manual).

Test results can be stored on the instrument. PC software HVLink PRO that is supplied

as a part of standard set enables transfer of measured results to PC where can be

analyzed or printed.

MI 3205 TeraOhm XA 5kV Safety and operational considerations

6

2 Safety and operational considerations

2.1 Warnings and notes

In order to maintain the highest level of operator safety while carrying out various tests

and measurements Metrel recommends keeping your TeraOhm XA 5kV instruments in

good condition and undamaged. When using the instrument, consider the following

general warnings:

 The symbol on the instrument means »Read the Instruction manual with

special care for safe operation«. The symbol requires an action!

 The symbol on the instrument means “Hazardous voltage may be

present at the test terminals!”.

 If the test equipment is used in a manner not specified in this user manual,

the protection provided by the equipment could be impaired!

 Read this Instruction manual carefully, otherwise the use of the instrument

may be dangerous for the operator, the instrument or for the equipment

under test!

 Do not use the instrument or any of the accessories if any damage is

noticed!

 Consider all generally known precautions in order to avoid risk of electric

shock while dealing with hazardous voltages!

 Do not use the instrument in supply systems with voltages higher than

300 V!

 Service intervention or adjustment is only allowed to be carried out by

competent authorized personnel!

 Use only standard or optional test accessories supplied by your distributor!

 Hazardous voltages exist inside the instrument. Disconnect all test leads,

remove the power supply cable and switch off the instrument before

opening the battery compartment.

 All normal safety precautions must be taken in order to avoid risk of electric

shock while working on electrical installations!

MI 3205 TeraOhm XA 5kV Safety and operational considerations

7

Warnings related to measurement functions:

Working with the instrument

 Use only standard or optional test accessories supplied by your distributor!

 Equipment under test must be switched off (i.e. de-energized) before test leads

are connected to the equipment.

 Always connect accessories to the instrument and to the test object before

starting high voltage measurement. Do not touch test leads or crocodile clips

during measurement. Only hand-held part of high voltage test lead with tip is

allowed to be touched (held) during measurement.

 Do not touch any conductive parts of equipment under test during the test, risk of

electric shock!

 Make sure that the tested object is disconnected (mains voltage disconnected)

before starting the Insulation Resistance measurement!

 In case of a capacitive test object (long tested cable etc.), automatic discharge of

the object may not be done immediately after finishing the measurement –

“Please wait, discharging” message will be displayed.

 Do not connect test terminals to an external voltage to prevent any damage to the

test instrument!

Handling with capacitive loads

 Note that 40 nF charged to 1 kV or 8 nF charged to 5 kV are hazardous live!

 Never touch the measured object during the testing until it is totally discharged.

Warnings related to Batteries:

 Use only batteries provided by the manufacturer.

 Never dispose of the batteries in a fire as it may cause them to explode or

generate a toxic gas.

 Do not attempt to disassemble, crush or puncture the batteries.

 Do not short circuit or reverse polarity the external contacts on a battery.

 Keep the battery away from children.

 Avoid exposing the battery to excessive shock/impacts or vibration.

 Do not use a damaged battery.

 The Li – ion battery contains safety and protection circuit which, if

damaged, may cause the battery to generate heat, rupture or ignite.

 Do not leave a battery on prolonged charge when not in use.

 If a battery has leaking fluids, do not touch any fluids.

 In case of eye contact with fluid, do not rub eyes. Immediately flush eyes

thoroughly with water for at least 15 minutes, lifting upper and lower lids,

until no evidence of the fluid remains. Seek medical attention.

MI 3205 TeraOhm XA 5kV Safety and operational considerations

8

2.2 Battery and charging of Li-ion battery pack

The instrument is designed to be powered by rechargeable Li-ion battery pack or with

mains supply. The LCD contains an indication of battery condition and the power source

(upper left section of LCD). In case the battery is too weak the instrument indicates this

as shown in Figure 2.1.

Symbol:

Indication of low battery.

Figure 2.1: Battery test

The battery is charged whenever the power supply is connected to the instrument. The

power supply socket is shown in Figure 2.2. Internal circuit controls (CC, CV) charging

and assures maximum battery lifetime. Nominal operating time is declared for battery

with nominal capacity of 4.4 Ah.

Figure 2.2: Power supply socket (C7)

The instrument automatically recognizes the connected power supply and begins

charging.

Symbol:

Indication of battery charging

Figure 2.3: Charging indication

Battery and charging characteristic Typical

Battery type VB 18650

Charging mode CC / CV

Nominal voltage 14,8 V

Rated capacity 4,4 Ah

Max charging voltage 16,7 V

Max charging current 1,2 A

Max discharge current 2,5 A

Typical charging time 4 hours

MI 3205 TeraOhm XA 5kV Safety and operational considerations

9

Typical charging profile which is also used in this instrument is shown in Figure 2.4.

Figure 2.4: Typical charging profile

where:

V

REG

............................... Battery charging voltage

V

LOWV

.............................. Precharge threshold voltage

I

CH

................................... Battery charging current

I

CH/8

................................. 1/8 of the charging current

2.2.1 Precharge

On power up, if the battery voltage is below the V

LOWV

threshold, the charger applies 1/8

of the charging current to the battery. The precharge feature is intended to revive deeply

discharged battery. If the V

LOWV

threshold is not reached within 30 minutes of initiating

precharge, the charger turns off and a FAULT is indicated.

Figure 2.5: No battery indication

Note:

 As a safety backup, the charger also provides an internal 5-hour charge timer for

fast charge.

MI 3205 TeraOhm XA 5kV Safety and operational considerations

10

Typical charging time is 4 hours in the temperature range of 5°C to 60°C.

T

LTF

T

COOL

T

WARM

T

HTF

Current

Figure 2.6: Typical charging current vs temperature profile

where:

T

LTF

................................. Cold temperature threshold (typ. -15°C)

T

COOL

.............................. Cool temperature threshold (typ. 0°C)

T

WARM

............................. Warm temperature threshold (typ. +60°C)

T

HTF

................................ Hot temperature threshold (typ. +75°C)

The charger continuously monitors battery temperature. To initiate a charge cycle, the

battery temperature must be within the T

LTF

to T

HTF

thresholds. If battery temperature is

outside of this range, the controller suspends charge and waits until the battery

temperature is within the T

LTF

to T

HTF

range.

If the battery temperature is between the T

LTF

and T

COOL

thresholds or between the

T

WARM

and T

HTW

thresholds, charge is automatically reduced to I

CH/8

(1/8 of the charging

current).

MI 3205 TeraOhm XA 5kV Safety and operational considerations

11

2.2.2 Li – ion battery pack guidelines

Li – ion rechargeable battery pack require routine maintenance and care in their use and

handling. Read and follow the guidelines in this user manual to safely use Li – ion

battery pack and achieve the maximum battery life cycles.

Do not leave batteries unused for extended periods of time (self – discharge).

When a battery has been unused for 6 months, check the charge status see chapter

3.4.4 Battery, time and communication indication. Rechargeable Li – ion battery pack

have a limited life and will gradually lose their capacity to hold a charge. As the battery

loses capacity, the length of time it will power the product decreases.

Storage:

 Charge or discharge the instruments battery pack to approximately 50% of

capacity before storage.

 Charge the instrument battery pack to approximately 50% of capacity at least

once every 6 months.

 Store the instrument at temperatures between 5 °C and 20 °C.

Transportation:

 Always check all applicable local, national, and international regulations before

transporting a Li – ion battery pack.

Handling Warnings:

 Use only batteries provided by the manufacturer.

 Do not disassemble, crush, or puncture a battery in any way.

 Do not short circuit or reverse polarity the external contacts on a battery.

 Do not dispose of a battery in fire or water.

 Keep the battery away from children.

 Avoid exposing the battery to excessive shock/impacts or vibration.

 Do not use a damaged battery.

 The Li – ion battery contains safety and protection circuit which, if

damaged, may cause the battery to generate heat, rupture or ignite.

 Do not leave a battery on prolonged charge when not in use.

 If a battery has leaking fluids, do not touch any fluids.

 In case of eye contact with fluid, do not rub eyes. Immediately flush eyes

thoroughly with water for at least 15 minutes, lifting upper and lower lids,

until no evidence of the fluid remains. Seek medical attention.

MI 3205 TeraOhm XA 5kV Instrument description

12

2.3 Standards applied

The TeraOhm XA 5kV instrument is manufactured and tested in accordance with the

following regulations:

Electromagnetic compatibility (EMC)

EN 61326

Electrical equipment for measurement, control and laboratory

use – EMC requirements Class A

Safety (LVD)

EN 61010 - 1

Safety requirements for electrical equipment for measurement,

control and laboratory use – Part 1: General requirements

EN 61010 - 2 - 030

Safety requirements for electrical equipment for measurement,

control and laboratory use – Part 2-030: Particular requirements

for testing and measuring circuits

EN 61010 - 031

Safety requirements for hand-held probe assemblies for electrical

measurement and test.

Some further recommendations

IEEE 43 – 2000

Recommended Practice for Testing Insulation Resistance of Rotating

Machinery:

 1 MΩ + 1 MΩ / 1000 V rating of equipment for insulation systems prior to 1970;

 5 MΩ for random wound motors under 600 Volts;

 100 MΩ for form wound motors over 600 Volts, and armatures;

IEC 60439-1

Low-voltage switchgear and control gear assemblies - Part 1:

Type-tested and partially type-tested assemblies:

 Scope of the insulation resistance test: alternative method for verification of

dielectric properties by insulation resistance measurement;

 Description: a d.c. test voltage (500 V) is applied to the insulation and its

resistance is measured. Insulation is proper, if its resistance is high enough (1000

Ω / V of circuit rated voltage);

IEC 61558

Isolating transformers and safety isolating transformers:

 Test voltage: 500 V, measurement period: 1 min;

 Minimum insulation resistance for basic insulation: 2 MΩ;

 Minimum insulation resistance for supplementary insulation: 5 MΩ;

 Minimum insulation resistance for reinforced insulation: 7 MΩ;

Li – ion battery pack

IEC 62133

Secondary cells and batteries containing alkaline or other non-

acid electrolytes - Safety requirements for portable sealed

secondary cells, and for batteries made from them, for use in

portable applications.

Note:

Immunity to radiated RF fields (Field strength: 10V/m, Modulation: AM, 80%, 1 kHz)

Voltage Range Operational conditions Disturbance < 5 % Disturbance > 5 %

50 V 100 MΩ 300 MHz ÷ 900 MHz 900 MHz ÷ 1 GHz

Note about EN and IEC standards:

 Text of this manual contains references to European standards. All standards of

EN 6XXXX (e.g. EN 61010) series are equivalent to IEC standards with the same

number (e.g. IEC 61010) and differ only in amended parts required by European

harmonization procedure.

MI 3205 TeraOhm XA 5kV Instrument description

13

3 Instrument description

3.1 Instrument casing

The instrument is housed in a plastic box that maintains the protection class defined in

the general specifications.

3.2 Operator’s panel

The operator’s panel is shown in Figure 3.1 below.

Figure 3.1: The operator’s panel

Keypad Section:

1

START / STOP

Start or stop measurement.

2

ON / OFF

Switches the instrument power on or off.

The instrument automatically turns off 15 minutes after the

last key was pressed (Hard OFF – hold key for 8 s).

3

MEM

Store / recall / clear tests in memory of the instrument.

4

SELECT

To enter set-up mode for the selected function or to select

the active parameter to be set.

5,6

 

Select an option upward, downward.

7,8

 

Decrease, increase the selected parameter.

9

ESC

Exit the selected mode.

MI 3205 TeraOhm XA 5kV Instrument description

14

10

☼

Turn the display backlight ON or OFF.

Instrument’s RESET (hold key for 5 s or more).

Display Section:

20 High voltage warning light (red).

Terminal Section:

11

+ Rx

Positive high voltage output terminal.

12,13

GUARD

Guard input terminals.

14

- Rx

Negative high voltage output terminal.

Power and Communication Section:

19

C7

Input power supply socket (C7)

18

USB

USB communication port (standard USB connector - type B)

18

RS232

RS232 communication port (standard RS232 9-pin D

female)

Warnings!

 Maximum allowed voltage between any test terminal and ground is 600 V!

 Maximum allowed input voltage between test terminals is 50 V! Use original

test accessories only!

MI 3205 TeraOhm XA 5kV Instrument description

15

3.3 Accessories

The accessories consist of standard and optional accessories. Optional accessories can

be delivered upon request. See attached list for standard configuration and options or

contact your distributor or see the METREL home page: http://www.metrel.si.

3.3.1 Test leads

The standard length of high voltage shielded test lead with tip is 2 m. The standard

length of high voltage shielded test leads with (red, black) banana connectors is 3 m;

optional lengths are 8 m and 15 m. For more details see attached list for standard

configuration and options or contact your distributor or see the METREL home page:

http://www.metrel.si.

All test leads are made of high voltage shielded cable, because shielded cable provides

higher accuracy and immunity to disturbance of measurements that can occur in

industrial environments.

High voltage shielded test leads with High voltage alligator clips.

Application notes:

This test leads are designed for diagnostic

testing of insulation. They can also be used

for hand held testing with test voltages up to

5 kV d.c..

Insulation ratings:

 High voltage banana connectors (red,

black): 5 kV d.c. (reinforced insulation);

 Alligator clips (red, black): 5 kV d.c.

(reinforced insulation);

 Guard banana connector (green): 600

V CAT IV (reinforced insulation);

 Cable (yellow): 12 kV (shielded).

Figure 3.2: HV test leads with alligator clips

Guard test lead with alligator clips

Insulation ratings:

 Guard test lead with banana

connectors (green): 600 V CAT IV

(reinforced insulation);

 Alligator clip (green): 600 V CAT IV

(reinforced insulation)

Figure 3.3: Guard lead with alligator clip

MI 3205 TeraOhm XA 5kV Instrument description

16

3.4 Display organization

Figure 3.4: Typical function display and graph screen

1 Measurement result window

2 Measurement control window

3 Messages window

4 Battery, time and communication indication

5 Measurement result line

6 Graphical presentation of measured data

3.4.1 Measurement result window

Measurement window shows all relevant data during measurement campaign.

Figure 3.5: Measurement window

Measured Insulation

resistance

Is shown in the center of a screen with the largest font. During

measurement campaign this result is refreshed every few

seconds. When the measurement is completed result is hold on

screen, until new measurement is started.

Bar graph

Graphically represents measured insulation resistance in respect

to the measurement range. It also displays limit value if it is

enabled.

U

Shows the output voltage. During measurement campaign this

result is refreshed every few seconds. When the measurement is

completed result is hold on screen, until new measurement is

started.

I

Shows the input current. During measurement campaign this

result is refreshed every few seconds. When the measurement is

completed result is hold on screen, until new measurement is

started.

MI 3205 TeraOhm XA 5kV Instrument description

17

C

Shows the capacitance measured at the output terminals. Value

of capacitance is measured during the final discharge of the test

object.

R1, R2, R3

Show resistances measured at Timer1, Timer2 and Timer3.

When the measurement is completed result is hold on screen,

until new measurement is started (appears only in Diagnostic

Test).

R1, R2, R3,R4, R5

Show resistances measured at steps one to five. When the

measurement is completed result is hold on screen, until new

measurement is started (appears only in Step Voltage Test).

U1, U2, U3, U4, U5

Show voltages measured at steps one to five. When the

measurement is completed result is hold on screen, until new

measurement is started (appears only in Step Voltage Test).

DAR

Show the Dielectric Absorption Ratio. When the measurement is

completed result is hold on screen, until new measurement is

started (appears only in Diagnostic Test).

PI

Show the Polarization Index. When the measurement is

completed result is hold on screen, until new measurement is

started (appears only in Diagnostic Test).

DD

Show the Dielectric Discharge result. When the measurement is

completed result is hold on screen, until new measurement is

started (appears only in Diagnostic Test).

f

Shows frequency of the measured voltage (appears only in True

RMS Voltmeter).

t

Shows test time (mm:ss).

3.4.2 Measurement control window

Control window permit user to modify control measurement parameters.

Figure 3.6: Control window

Un

Allows user to set the desired test voltage.

Timer1

Allows user to set the desired measurement duration in

Insulation Resistance test.

Delay for starting DAR measurement in Diagnostic test.

(mm:ss) – step 1 s (max time 99 min).

MI 3205 TeraOhm XA 5kV Instrument description

18

Timer2

Delay for starting PI measurement (mm:ss) – step 1 s (max time

99 min).

Timer3

Allows user to set the desired measurement duration (mm:ss) –

step 1 s (max time 99 min).

DD

Allows user to enable or disable Dielectric Discharge

measurement.

Itrgg

Allows user to set the desired trigger level – step 100 μA (max

current 5 mA).

Tstart

Allows user to set the start test voltage time (mm:ss) – step 1s

(max time 99 min).

Tend

Allows user to set the constant end test voltage time (mm:ss) –

step 1 s (max time 99 min).

Ustart

Allows user to set the desired start test voltage.

Uend

Allows user to set the desired end test voltage.

Tramp

Allows user to set the duration of the test ramp (mm:ss) – step 1

s (max time 99 min).

HI Lim

Allows user to set the high limit (value is evaluated at the end of

the measurement).

AVG

Allows user to set the additional averaging of the result (OFF, 5,

10, 30, 60).

3.4.3 Message window

In the message field warnings and messages are displayed.

Figure 3.7: Message window

MI 3205 TeraOhm XA 5kV Instrument description

19

High voltage is present on measuring terminals (> 50 V rms).

Test result can be saved.

AC noise is present on the measuring terminals (+ Rx, - Rx).

A Breakdown or Over voltage event has accrued.

Instrument is overheated. Measurement process is disabled.

Graph is enabled.

Graph logging is enabled (internal Flash memory).

Internal Flash memory is full (graph logging is disabled).

Measurement result is within defined limits.

Measurement result is out of defined limits.

3.4.4 Battery, time and communication indication

These symbols indicate the charge condition of a battery, charger connection and

communication status. Time indication is also present.

Battery capacity indication.

Low battery.

Recharge the battery.

Recharging in progress (if mains supply cable is connected).

Time indication (hh:mm).

USB communication is enabled.

Bluetooth communication is enabled.

Note:

 Date and time is attached to each stored result.

MI 3205 TeraOhm XA 5kV Instrument description

20

3.4.5 Measurement result line

R

Shows Insulation resistance. During measurement campaign this

result is refreshed every few seconds. When the measurement is

completed it represents Insulation resistance at cursor position.

U

Shows the output voltage. During measurement campaign this

result is refreshed every few seconds. When the measurement is

completed it represents output voltage at cursor position.

t

Shows test time (mm:ss). When the measurement is completed

it represents time at cursor position.

Note:

 Averaging in measurement result line is disabled during measurement campaign

in all functions regardless of settings.

3.4.6 Graphical presentation of measured data

Figure 3.8: Graph screen

Measured or averaged Insulation resistance values in relation to time of measurement

are represented in this two dimensional R/t diagram. Online plotting, during

measurement, can also be observed. When the measurement is completed cursor is

attached to the graph for detail analysis.

3.4.7 Backlight operation

After turning the instrument ON the LCD backlight is automatically turned ON. It can be

turned OFF and ON by simply clicking the ☼ (LIGHT) key.

Note:

 If you press and hold the Light (☼) key for approximately 5 s the instrument will

RESET!

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METREL MI 3205 User manual

METREL MI 3205 User manual

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